This picture of Olga with her father and two guards, taken in 1917 after the revolution, reminds me of a quote by Klavdiya Bitner, who had become a tutor of the younger children in Tobolsk: "There were times when she smiled when you would sense that the smile was all on the surface, and that deep down inside her soul, she was not smiling, but sad."
It's clear that in this picture her smile is very forced